Cutter attachment for sewing machines



June 15 1926.

H. JACOVITZ CUTTER ACLTACHWSNTI Fon SEWING MACHINES Filed .luly 1, 1925 NVENTO? MJACOV/TZ.

A TTORNE Y Si A\\\\ Patented .lune l5, 1926.

UNITED STATES EEARRY JACOVITZ, OF NEW YORK, N. Y.

CUTTER`ATTACHMENT FOR SEW'ING MACHINES.

Application filed .Tu-ly 1, 1925. Serial No. 40,729.

My invention relates to cutter attachments for the picot edge stitching sewing machines and has reference more particularly to a rotary knife located at the presser foot and operated from the ily-wheel of the sewing machine.

Another object of the invention is to provide a cutter attachment which can be raised independently of the presser foot ortherewith.

Another object of the invention is to provide a cutter attachment which can be easily thrown into or out of operative engagement without reducing thespeed of the machine.

In the`appended drawing forming part of this application, Figure 1 is a rear elevation of a sewing machine provided with an embodiment of my invention. In this figure the attachment is illustrated in full lines, while the sewing machine proper, parts of which do not enter in the combination with my attachment, are shown `in broken lines.

Figure 2 is an end elevation of the sewing machine, the cutter attachment being shown in solid lines with the parts entering thereto in combination, while the other part of the sewing machine is shown in broken lines.

Figure 3 is a Vertical section through the cutter attachment on line 3/3, Figure 5. Figure 4 is a section on line 4/4, Figure 5, the cutter attachment in this figure being shown in a raised or non-operative position, and Figure 5 is an elevation of the cutter attachment in direction of arrow 5 as shown in Fi ure 1.

Re erring to the drawing, 10 is a rotary knife mounted to rotate with a shaft 11 to which is keyed a gear 12. Shaft 11 is rotatively mounted in a bearing 13 of a carriage 14. Said carriage 14 is movable on the presser foot body 15 through the medium of slots engaged by screws 16.

To make the structure more rigid at the presser foot, a spacer plate 17 is interposed between the carriage 14 and the presser foot body 15. This plate 17 is secured firmly to the presser foot body. Inthe carriage, 14, is revolubly mounted a shaft 18 to which are pinned a gear 19 and a bevel pini-on 20. The motion from the gear 19 to the gear 12 is transmitted by an idler gear 21, also mounted on the carriage 14. Therefore, the cutter 10 gears 12, 21 and 19 and also the bevel pinion 2O will move bodily with the carriage 14 when the same is moved;

The movement of the carriage `is controlled by a latch pin 22, which. engages the plate 17 in either of theholes 23, 24, accordmg to whether the cutter is in inoperative or 1n operative position. See Figures 3 and 4, respectively. The latchpin is actuated by a bell crank lever 25, the spring 26 of which normally tends to move the pin 22 into engagement with the plate 17. [A thumb piece 27 is provided on the carriage 14 to co-operate with the bell crank lever 25. i

'Ifhe presser foot vbody 15 is secured in an ordinary way to a tubular presser, foot lbar 2S. The tubular presser'foot bar is operated in the ordinary way, that is to say, when it is raised, the presser foot is raised from the platen of themachine. Revolvablyy mounted 1n. the tubular presser foot bar 28 is a shaft 29.' The lower end vof 4the shaft29.

carries a bevel gear 30 constrained to revolve with the shaft and which gear 30 is preferably made to bear in the lower part of the presser foot body 15. -The bevel kgear 30 meshes with the bevel pinion 2() when the rotary cutter 10 is in operative position, as shown in Figure 3, but when the rotary cutter 10 is placed into inoperative position, the pinion 20 is raised out of engagement from the bevel gear 30. See Figure 4.

The upper end of the shaft 29 also carries a bevel pinion 3l, which is in mesh with a bevel gear 32, to which gear 32 motion `is transmitted through a shaft 33 and a wheel 34 bearing on the fly-wheel 35 of the sewing machine. Suitable bearings 36 are provided for the shaft 33 on the machine. When the tubular presser bar 28 is raised it carries therewith the shaft 29 through the medium of a collar 37 and thereby disengages the bevel pinion 31 from the bevel gear 32.

To obtain the `desired cutting effect from the cutter 10, the platen 38 is provided with a slit to accommodate the edge of the cutter when the same is in operative position. As already noted, the entire mechanism is located on the inner side of the presser foot body and is flat against it, so that it will not interfere with the fabric being worked on, and which permits an easy access to any part of the attachment and in no way interferes with any part of the mechanism of the sewing machine.

From the above description it will be seen that the 'bevel gear 3() with the bevel pinion 2O forms the coupling means for the vcutter l to the shaft 29, and this coupling means is controlled by the movement off the vcutter to and from the platen 3S. In the same light, the bevel pinion '3i and the bevel gear 32 constitute the coupling means for the shaft 29 from the shaft B3, and the movement of the presser bar 28 to and from the platen also controls the coupling of said gears 3l and '82.

"I claim:

l. A vcutter attachment for 'sewing machines comprising in combination .a tubular presserbar, a cutter carried by the 'bar and means for transmitting motion from the sewing machine to the cutter through the tubular bar.

2. A cutter attachment for sewing machines comprising in combination a tubular presser bar, a circular cutter carried by the bar, and motion transmission means from lthe machine to the lcutter thro-ugh the tubular bar.

3. A cutter attachment for sewing machines comprising in vcombination a tubular presser bar, a shaft revolubly mounted in said tubular bar, 4'a circular 'cntter carried by 'the bar, means for coupling and uncoupling said cutter to the shaft, and 'motion transmission means from the machine to the shaft.

4. A cutter attachment for sewing machines comprising in combination a tubular presser' `bar, a shaft revolub'ly mounted in the bar, a circular cutter -carried by the bar, motion transmission means from the shaft to the cutter, means for coupling and uncoupling the motion transmission means to the cutter and motion transmission means from the machine to said shaft.

5. A cutter attachment for sewing machines comprising' in combination a tubular presser bar, a shaft revolu'bly mounted therein and adapted to participate in the longitudinal `movement of'fsaid leur5 motion transmission means from lthe -inaChi-ne :to the shaft, a Vcircular 'cutter on the said bar, fa train of lgears for rotating said cutter .and coupling `means interposed between said shaft and train of' gears.

6. A cutter attachment for sewing -vmachines comprising in combination a tubular presser bar, a shaft revolubly mounted in said bar and adapted to partici nate in the longitudinal displacement of said` ar, motion transmission means from the 'machine to -the shaft for revolving the same, a carriage fen said bar, a circula-r cutter rcvoflnlbly mounted in the carriage, a gear carried .by :said shaft yand a gear carried by said carriage, means for moving Isai-d carriage, in pre-detfeisiiinetl `positions whereby the two gears 'may be coupled or uncoupled, and motion 'transmission means from said gear fof the carriage to the cutter thereon.

HARRY JACOVITZ. 

